The status of the project is... I dunno. In progress, but not really going anywhere.
As for what needs doing? Ideally, every single building or object that does exist, has existed and will exist in, on and around any British railway.
Of course, the above causes severe testicular cancer, so instead, we won't do that. I would recommend drawing any you deem significant from the rail network;
Kings Cross, Manchester Piccadilly, Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch, whatever takes your fancy. This set isn't planned, isn't organised and isn't very good at jokes, so draw whatever the heck you feel like drawing. It's open to anyone who wishes to contribute. This not only means sprites, but information, ideas, rain coats, pictures and the all illusive...
So hey, why not lend a helping hand/pencil/keyboard/stress ball today, and get your free imaginary service pack.